Influence of Blending Degree Between Aged and Virgin Asphalt on Performance of Hot Recycled Asphalt Mixture

Abstract

Abstract: The blending degree between aged and virgin asphalt has a significant influence on performance of asphalt mixture in hot recycling procedure. At present, the blending degree is not considered in the mix design of hot recycled asphalt mixture in China. In order to explore the influence of the blending degree on technical performance and composition design of hot recycled asphalt mixtures, the high temperature performance, low temperature performance, water stability and anti-reflection cracking performance of the mixture prepared by conventional mixing method and artificially simulated 100% blending with mass fraction of 20%, 30%, 40%, 50% recycled materials for waste asphalt pavement (RAP) were studied. On the basis of establishing the relationship between road performance difference and RAP content under two mixing methods, the boundary RAP content which needs to consider the blending degree was determined. The results show that with the increase of RAP content, the high temperature performance of the mixture is enhanced, while the low temperature performance, water stability and anti-reflection cracking performance are reduced. Compared with the conventional mixing, the low temperature performance, water stability and anti-reflection cracking performance of the mixture mixed with 100% blending between aged and virgin asphalt are better, but the high temperature performance is poor. The difference of high temperature performance, low temperature performance and water stability increases gradually with the increase of RAP content, while the difference of anti-reflection cracking performance do not change significantly. Taking the content corresponding to the average growth rate of performance difference as the boundary content, it is recommended that when the RAP content is more than 30%, the influence of the blending degree between aged and virgin asphalt should be considered in the design of hot recycled asphalt mixture.

Key words: hot recycled asphalt mixture, conventional mixing, 100% blending between aged and virgin asphalt, RAP content, performance influence, boundary content

CLC Number:

U414

HAO Peiwen, LI Hongxiang, CUI Yingxiang, XU Jinzhi. Influence of Blending Degree Between Aged and Virgin Asphalt on Performance of Hot Recycled Asphalt Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3837-3846.

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